Difference in early 4l80e and late 4l80e transmission?

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Boost27

Member
Right now in in the process of swapping a 2003 lq4 and 2001 4l80e transmission in to my 1992 GMC typhoon. I bought a kit with all the brackets and mounts from http://sytyperformance.com/ The problem in that i the parts for the transmission are not fitting. I was hoping some one on this forum could give me some incite on the difference between the pre 95 transmissions and the post 05 transmissions? Are the cases the same length?

sincerely
Kevin B

Here is a link to my facebook with pic for my problem.
http://www.facebook.com/album.php?aid=191101&id=506306871
 
Norm

Norm

Donating Member
Re: Difference in early 4l80e and late 4l80e transmission?

Slot the holes on the tranny crossmember so it lines up. What are you going? Turbo or regular induction? I'm looking at the bolt hitting the mount also, you might have to shim up the tranny mount so it doesn't hit it, grind the bolt head down to give you some more play room.
 
Try Me

Try Me

New member
Re: Difference in early 4l80e and late 4l80e transmission?

I thought the only difference in the cases was the bell housing and the cooling line locations. Length should be the same for both. I have the older style case in mine, I just had to change it over to the newer style wiring harness inside for my TCI controller to work.
 
B

Boost27

Member
Re: Difference in early 4l80e and late 4l80e transmission?

Just going to be na for now. Just trying to get it on the road again. I just want to get everything bolted on. Any for all the info. any other ideas let me know
 
Norm

Norm

Donating Member
Re: Difference in early 4l80e and late 4l80e transmission?

What are you using for exhaust manifolds? I heard Vette ones work with a small amount of work on them.
 
B

Boost27

Member
Re: Difference in early 4l80e and late 4l80e transmission?

I was going to try to use the truck 6.0L manifolds. They are really tight with the stock steering shaft. I think it will work with jeep steering shaft.
 
Norm

Norm

Donating Member
Re: Difference in early 4l80e and late 4l80e transmission?

Boost27 said:
I was going to try to use the truck 6.0L manifolds. They are really tight with the stock steering shaft. I think it will work with jeep steering shaft.
Click to expand...

I just sold my spare truck manifolds on the ls forumn, maybe I should have kept them around for a trial set, i'm hoping my vette ones work for me.If not ,I'm thinking of ordering the hedman headers.
 
B

Boost27

Member
Re: Difference in early 4l80e and late 4l80e transmission?

By chance any one have a wiring diagram for the LS harness to the typhoon?
 
sparkwire

sparkwire

Donating Member
Re: Difference in early 4l80e and late 4l80e transmission?

did you get it in yet? Loosen your motor mount bolts on the frame pads, they are slotted to slide back and forth.
 
B

Boost27

Member
Re: Difference in early 4l80e and late 4l80e transmission?

only one of my frame pads are sloted where i could move it back
 
sparkwire

sparkwire

Donating Member
Re: Difference in early 4l80e and late 4l80e transmission?

Just maybe you got a v6 transmission crossmember??
 
sparkwire

sparkwire

Donating Member
Re: Difference in early 4l80e and late 4l80e transmission?

you have to change that shifter shaft, or your prop shaft will not fit.
 
eviltwin

eviltwin

"junkyard syclone"
Re: Difference in early 4l80e and late 4l80e transmission?

98' f-body non cast manifolds should fit. They fit with the turbotime mounts on my ty
 
B

Boost27

Member
Re: Difference in early 4l80e and late 4l80e transmission?

still working on this problem have not got it figured out yet
 
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